Casing for a watch



FIG. 1 is a perspective elevational view of a casing for a watch;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is an end elevational view thereof; the other end elevational view being a mirror image is not shown; and,

FIG. 6 is the bottom plan view. 

The ornamental design for a "casing for a watch", as shown and described. 